v3.19.2

Segment information (Details)	3 Months Ended		6 Months Ended
Segment information (Details)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)
Segment Reporting Information [Line Items]
Net sales	$ 75,807,093	$ 64,923,960	$ 133,920,573	$ 114,707,413
Cost of Sales	57,436,018	53,614,034	102,888,969	95,831,160
Gross Profit	18,371,075	11,309,926	$ 31,031,604	18,876,253
Number of Reportable Segments \| segment			2
Lithium Business [Member]
Segment Reporting Information [Line Items]
Net sales	62,255,334	48,503,856	$ 104,985,501	85,100,511
Cost of Sales	47,382,082	39,755,643	81,010,550	70,546,982
Gross Profit	14,873,252	8,748,213	23,974,951	14,553,529
Ni-MH Batteries and Accessories [Member]
Segment Reporting Information [Line Items]
Net sales	13,551,759	16,420,104	28,935,072	29,606,902
Cost of Sales	10,053,936	13,858,391	21,878,419	25,284,178
Gross Profit	$ 3,497,823	$ 2,561,713	$ 7,056,653	$ 4,322,724

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Highpower International, Inc. 10-Q